Successive pyrolysis system of waste synthetic-highly polymerized compound

ABSTRACT

Disclosed is a successive pyrolysis system of waste synthetic-highly polymerized compound for successively pyrolizing combustible waste by indirect heating at a pyrolysis chamber maintaining an anaerobic or hypoxic environment, and producing refined oil like heavy oil and light oil according to boiling points at a distillation column to be used as heat source for the pyrolysis of the waste. The successive pyrolysis system comprises a hopper; an automatic waste injection device, which discharges a predetermined amount of waste from the hopper; a pyrolysis chamber for maintaining a high-temperature and hypoxic environment, and successively pyrolizing the waste by indirect heating; a gas burning chamber for burning noncondensable gas among pyrolysis gas produced at the time of the pyrolysis of the waste, and providing heat of a predetermined temperature to the outer surface of the pyrolysis chamber to be used as heat source for the pyrolysis of the waste; a refined oil producing means for producing refined oil from the pyrolysis gas reformed after going through catalyst reaction and providing residual noncondensable gas to the gas burning chamber; and an automatic discharging device for successively discharging ashes transported after being pyrolized from the pyrolysis chamber.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims benefit under 35 U.S.C. §119 from Korean PatentApplication No. 2004-77580, filed on Sep. 25, 2004, the entire contentof which is incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a successive pyrolysis system of wastesynthetic-highly polymerized component to successively pyrolizecombustible waste like waste plastics by indirect heating at a pyrolysischamber, in which an anaerobic or hypoxic environment is maintained, andproduce refined oil like heavy oil and light oil according to boilingpoints at a distillation column to be used as heat source for thepyrolysis of the waste.

2. Description of the Related Art

More particularly, the present invention relates to a successivepyrolysis system of waste synthetic polymerized component, whichsimultaneously performs the processes of successively desiccating,melting and pyrolizing the waste synthetic-highly polymerized compoundlike waste plastics in a pyrolysis chamber, in which a high-temperatureand hypoxic environment is maintained, and does not need separate supplyof fuel from the outside by recycling the noncondensable gas among thepyrolysis gas as heat source for the pyrolysis.

The pyrolysis principle applied in above-described pyrolysis system isthat when heat is indirectly provided to combustible waste in ananaerobic or hypoxic environment, a reductive environment is created inthe pyrolysis chamber, and the combustible waste is decomposed andevaporated as gas and liquid, and what is not decomposed remains assolid (char).

That is, waste (waste synthetic-highly polymerized compound)+heat=gas(noncondensable gas)+liquid (refined oil)+solid (char).

The pyrolysis device for pyrolizing combustible waste like wasteplastics discharged from various factories adopts a batch method, bywhich a predetermined amount of waste is injected into a pyrolysischamber, a cover of the pyrolysis chamber is closed and the pyrolysischamber is heated at a predetermined temperature by providing heat ofhigh-temperature from the outside, and thereby the waste is pyrolizedand converted to gaseous, liquid or solid material.

The batch-type pyrolysis system involves many difficulties in pyrolizingwaste, in which various materials are mixed. Especially, when foreignmaterials (glassware, earth, nonferrous metals, etc.) are mixed, heattransfer is not smoothly performed, and there is limit in producingrefined oil from the waste by the pyrolysis, and thus utility valuethereof is very small.

On the other hand, a technique for producing refined oil like heavy oilaccording to boiling points from the pyrolysis gas by separatelyinstalling a distillation column at the side of the pyrolysis device forpyrolizing combustible waste, and utilizing the refined oil as heatsource of the pyrolysis is developed. Here, the pyrolysis chamber andthe transport shaft are exposed to heat of high-temperature (250-450°C.), are repeatedly expanded and contracted while the pyrolysis deviceis driven, and are thermal-expanded. Therefore, there is a problem thatthe piping that connects the pyrolysis chamber and the distillationcolumn is damaged or broken down.

SUMMARY OF THE INVENTION

Therefore, the object of the present invention is to provide asuccessive pyrolysis system of waste synthetic-highly polymerizedcompound that maximizes the operating rate of the pyrolysis device bysuccessively injecting a predetermined amount of waste and successivelydischarging ashes exhausted after going through the pyrolysis process,when pyrolizing waste synthetic-highly polymerized compound like wasteplastics by indirect heating in a pyrolysis chamber, in which ahigh-temperature and anaerobic or hypoxic environment is maintained.

Another object of the present invention is to provide a successivepyrolysis system of waste synthetic-highly polymerized compound, whereina distillation column for producing refined oil according to boilingpoints from the pyrolysis gas is installed perpendicularly to the upperpart of the pyrolysis gas outlet, and a buffer means is installed at theconnection portion between the pyrolysis gas outlet and the distillationcolumn to protect the connection portion against contraction andexpansion.

Another object of the present invention is to provide a successivepyrolysis system of waste synthetic-highly polymerized compound thatproduces refined oil such as heavy oil, light oil and volatile oilaccording to boiling points from the pyrolysis gas in the distillationcolumn and recycles the refined oil as heat source of the pyrolysis ofthe waste.

Another object of the present invention is to provide a successivepyrolysis system of waste synthetic-highly polymerized compound thatimproves the pyrolysis speed of the waste by optimizing the contactsurface area between the waste and the heat source of the pyrolysis atthe time of the pyrolysis.

In order to achieve the above-described objects of the presentinvention, there is provided a successive pyrolysis system of wastesynthetic-highly polymerized compound, comprising: a hopper, which wasteis provided to and is stored in a predetermined amount; an automaticwaste injection device, which discharges a predetermined amount of wastefrom the hopper, and comprises an air removing means for maintaining ahypoxic environment inside by removing external air flowing in alongwith the waste; a pyrolysis chamber for maintaining a high-temperatureand hypoxic environment, and successively pyrolizing the waste byindirect heating, in which two or more transport screws are installedrotatably by a driving means to transport, melt and evaporate the wasteprovided from the waste injection device; a gas burning chamber forburning noncondensable gas among pyrolysis gas produced at the time ofthe pyrolysis of the waste, and providing heat of a predeterminedtemperature to the outer surface of the pyrolysis chamber to be used asheat source for the pyrolysis of the waste provided to the pyrolysischamber; a refined oil producing means connected perpendicularly to theupper part of a gas outlet of the pyrolysis chamber, for producingrefined oil from the pyrolysis gas catalyst reacted at a catalysisreaction column according to boiling point at a distillation column, andproviding the refined oil to the gas burning chamber as initial fuel;and an automatic discharging device for successively discharging ashestransported after being pyrolized from the pyrolysis chamber, comprisingan air removing means for maintaining a hypoxic environment inside byremoving external air, which flows in from the outside when dischargingashes, and the pyrolysis gas discharged from the pyrolysis chamber

According to a preferred embodiment of the present invention, theabove-described waste injection device comprise a first pusher, which isinstalled on the bottom of a second slide gate to be slidingly moved ina horizontal direction, when a third cylinder is driven, and transfersthe waste discharged from an interim storing hopper in a horizontaldirection, and a second pusher, which is installed on the perpendicularupper part of the inlet of the pyrolysis chamber to be slidingly movedupward and downward when a fourth cylinder is driven, and injects thewaste transferred by the first pusher into the inlet of the pyrolysischamber.

Also, the above-described automatic waste injection device anddischarging device comprise a first slide gate, which is driven by thefirst cylinder to be slidingly moved along the guiding groove formed inthe gate body, and respectively opens and shuts off the hopper outletand the outlet of the pyrolized remnants, and a second slide gate, whichis driven by the second cylinder to be slidingly moved along the guidinggroove formed in the gate body and forms the interim storing hopper formaintaining a hypoxic state in a space between the first slide gate.

Also, the waste is measured by a load cell or a photo sensor and then isinjected into the hopper to store the waste in the hopper in apredetermined amount by a sensor for detecting fixed quantity injectioninstalled in the above-described hopper.

Also, the above-described first and second slide gates comprise anextension guide formed to be extended from the gate body for supportingthe slider to slide in a horizontal direction when the slider secedesfrom the guiding groove; a seal maintaining means, which consists of aball for maintaining seal by pressing the upper surface of the slidermoving slidingly along the guide groove formed in the gate body and theextension guide and sticking the slider to the body, and an elasticmember for elastically supporting the ball; and a guider, which isconnected to a connection groove formed between the bottom surface ofthe slider and the contact surface of the extension guide and preventsfriction between the gate body and the slider when the slider moves.

Also, the quality of the material of the guider is weaker than that ofthe slider, to prevent the above-described slider from being broken byfriction when the slider moves.

Also, a foreign material removing case is comprised. The foreignmaterial removing case is mounted on the gate body to communicate withthe guiding groove of the above-described first and the second slidegates, and accumulates foreign materials discharged from the guidinggrooves when the slider moves.

Also, the above-described pyrolysis chamber comprises a section forpreventing backward flow of gas having a circular section for minimizingthe gap between the transport screw and the inlet and outlet casing ofthe pyrolysis chamber and intercepting backward flow of the pyrolysisgas, a transport space formed on the lower part of the pyrolysis chamberfor transporting waste when the transport screw is driven, and apyrolysis gas staying space formed on the upper part of the pyrolysischamber for holding the pyrolysis gas evaporated when pyrolizing thewaste that are melted and evaporated.

Also, the cross section of the above-described pyrolysis chamber isformed to be a circle, an oval, a rectangle or a streamline.

Also, the size of the above-described pyrolysis gas staying space of thepyrolysis chamber is formed to be a half of the size of the diameter ofthe transport wing formed on the transport screw in the shape of aspiral.

Also, a connection member is comprised. The connection member isinstalled on the connection portion between the pyrolysis gas outlet ofthe pyrolysis chamber and the distillation column, and has elasticity toprotect the connection portion when the pyrolysis chamber is contractedand thermal-expanded in a longitudinal direction thereof, by therepeated driving thereof.

Also, the pyrolysis gas outlet of the above-described pyrolysis chamberis installed inside the transfer passage of heat source of pyrolysis ofthe waste.

Also, a second burner is installed in the transfer passage of heatsource of pyrolysis for pyrolizing the waste.

BRIEF DESCRIPTION OF THE DRAWINGS

The above aspects and features of the present invention will be moreapparent by describing certain embodiments of the present invention withreference to the accompanying drawings, in which:

FIG. 1 is a schematic diagram of a successive pyrolysis system of wastesynthetic-highly polymerized compound in accordance with the presentinvention.

FIG. 2 is a sectional view from line A-A in FIG. 1

FIG. 3 is a sectional view from line A-A in FIG. 1 showing a modifiedembodiment of a transport screw installed in a pyrolysis chamber.

FIG. 4 is an expanded view of main parts of part “B” illustrated in FIG.1.

FIG. 5 is an expanded view of main parts of part “C” illustrated in FIG.1.

FIG. 6 is an expanded view of main parts of part “D” illustrated in FIG.1.

FIG. 7 shows the functioning of the thermal expansion connectionillustrated in FIG. 6.

FIG. 8 shows applications of a slide gate for successively injecting anddischarging waste in a predetermined amount in the successive pyrolysissystem of waste synthetic-highly polymerized compound in accordance withthe present invention.

FIG. 9 shows applications of a pusher for compulsorily injecting thewaste into the pyrolysis chamber in the successive pyrolysis system ofwaste synthetic-highly polymerized compound in accordance with thepresent invention.

FIG. 10 is a sectional view from line E-E in FIG. 8.

FIG. 11 is a sectional view from line F-F in FIG. 8.

FIG. 12 is a sectional view from line G-G in FIG. 8.

FIG. 13 is an expanded view of the part “H” illustrated in FIG. 12.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Preferred embodiments of the present invention will be explained indetail on below, which is to explain the present invention in detail tothe extent that one skilled in the art may easily work the invention,and does not limit the technical idea and scope of the presentinvention.

As illustrated in FIGS. 1-12, the successive pyrolysis system of wastesynthetic-highly polymerized compound in accordance with the presentinvention comprises a hopper 3, which the waste is provided to and isstored in a predetermined amount; an automatic waste injection device 1,which automatically discharges a predetermined amount of waste from thehopper 3, and comprises an air removing means for maintaining a hypoxicenvironment inside by removing external air flowing in along with thewaste; a pyrolysis chamber 39 for maintaining a high-temperature(250-450° C.) and hypoxic environment, and successively pyrolizing thewaste by indirect heating, in which two or more transport screws 34 areinstalled rotatably by a driving means to transport, melt and evaporatethe waste provided from the waste injection device 1.

Here, it is needless to say that three transport screws 34 may be usedas illustrated in FIG. 3.

The above-described driving means comprises a driving motor 62, adriving gear 63 mounted on the driving motor 62, and a driven gear 63 a,which is mounted on one end of the transport screw 34, is connected tothe driving gear 63 through a chain 64, and rotates the transport screw34 having a transport wing 34 a formed to be in the shape of a spiralthereon.

Also, the successive pyrolysis system of waste synthetic-highlypolymerized compound in accordance with the present invention comprisesa gas burning chamber 37 for providing heat of a predeterminedtemperature to the outer surface of the pyrolysis chamber 39 by burningthe noncondensable gas among the pyrolysis gas produced when pyrolizingthe waste, to be used as heat source of the pyrolysis of the wasteprovided to the pyrolysis chamber 39; and a refined oil producing means100, which is connected perpendicularly to the upper part of gas outlet39 e of the pyrolysis chamber 39, for producing refined oil at thedistillation column 67 according to boiling points from the pyrolysisgas reformed after going through the catalysis reaction to reform highmolecular weight gas having many carbon rings to low molecular weightgas having less carbon rings at the catalysis reaction column 45, andproviding the residual noncondensable gas to the gas burning chamber asinitial fuel.

Also, the successive pyrolysis system of waste synthetic-highlypolymerized compound in accordance with the present invention comprisesan automatic discharging device 101 for successively discharging ashestransported after being pyrolized from the pyrolysis chamber, whichcomprises an air removing means for maintaining a hypoxic environmentinside by removing external air flowing in from the outside whendischarging ashes and removing the pyrolysis gas discharged from thepyrolysis chamber 39.

Also, the above-described automatic waste injection device 1 anddischarging device 101 comprise a first slide gate 5, wherein a slider23 is driven by the first cylinder 20 to be slidingly moved along theguiding groove 22 formed in the gate body 21, and respectively opens andshuts off the outlet of the hopper 3 and the outlet of the pyrolizedremnants 18, and a second slide gate 6, wherein a slider 23 is driven bythe second cylinder to be slidingly moved along the guiding groove 22formed in the gate body 21 and forms an interim storing hopper 7 formaintaining a hypoxic state in a space between the first slide gate 5.

Also, the air removing means for removing the external air flowing intothe interim storing hopper along with the waste comprises a filter 11communicating with the interim storing hopper 7 and removing foreignmaterials like dust, a vacuum valve 12 connected to a case receiving thefilter 11, a vacuum tank 13 connected to the vacuum valve 12 formaintaining a degree of vacuum below a predetermined pressure, and avacuum pump 14 connected to the vacuum tank 13.

Here, it is desirable to form a vacuum tank to have a capacity of morethan two times of the capacity of the interim storing hopper 7 at least.When the vacuum valve 12 is open, the air inside the interim storinghopper 7 is sucked into the vacuum tank 13 in an instant, and the vacuumvalve 12 is shut off.

Also, the above-described automatic waste injection device 1 comprises afirst pusher 9, which is installed on the bottom of a second slide gate6 to be slidingly moved in a horizontal direction, when a third cylinder25 is driven, and moves the waste discharged from the interim storinghopper 7 in a horizontal direction, and a second pusher 10, which isinstalled on the perpendicular upper part of the inlet of the pyrolysischamber 39 to be slidingly moved upward and downward when a fourthcylinder 26 is driven, and injects the waste moved by the first pusher 9into the inlet of the pyrolysis chamber 39.

Also, the waste provided by a transport conveyer 2 is measured by a loadcell (not illustrated) or a photo sensor (not illustrated) and then isinjected into the hopper 3 to store a predetermined amount of the wastein the hopper 3 by a sensor for detecting fixed quantity injection 4installed in the above-described hopper.

Also, the above-described first and second slide gates 5 and 6 comprisean extension guide 21 a formed to be extended from the gate body 21 forsupporting the slider 23 to slide in a horizontal direction when theslider secedes from the guiding groove 22; a seal maintaining means,which consists of a ball 27 for maintaining seal by pressing the uppersurface of the slider moving slidingly along the guide groove 22 formedin the gate body 21 and the extension guide 21 a and sticking the slider23 to the gate body 21, and an elastic member 28 for elasticallysupporting the ball 27; and a guider 30 connected to a connection groove29 formed between the bottom surface of the slider 23 and the contactsurface of the extension guide 21 a for preventing friction between thegate body 21 and the slider 23 when the slider 23 moves.

Also, the quality of the material of the guider 30 is weaker than thatof the slider 23, to prevent the slider 23 from being broken by frictionwhen the above-described slider 23 moves.

Also, a foreign material removing case 31 is comprised. The foreignmaterial removing case 31 is mounted on the gate body 21 to communicatewith the guiding groove 22 of the above-described first and the secondslide gates 5 and 6, accumulates foreign materials discharged from theguiding grooves 22 when the slider 23 moves, and has a door 31 a that isopened and shut off to remove foreign materials during the operation ofthe device.

Also, the above-described pyrolysis chamber 39, comprises a section forpreventing backward flow of gas 40,41, whose section is formed to be acircle, for minimizing the gap between the transport screw 34 and theinlet and outlet casings 39 a,39 b of the pyrolysis chamber 39 andintercepting backward flow of the pyrolysis gas, a transport space 39 cformed on the lower part of the pyrolysis chamber 39 for transportingwaste when the transport screw 34 is driven, and a pyrolysis gas stayingspace 39 d formed on the upper part of the pyrolysis chamber 39 forholding the pyrolysis gas evaporated when pyrolizing the waste that aremelted and evaporated.

Also, the cross section of the above-described pyrolysis chamber 39 isformed to be a circle, an oval, a rectangle or a streamline. Also, thesize of the above-described pyrolysis gas staying space 39 d of thepyrolysis chamber 39 is formed to be a half of the size of the diameterof the transport wing 34 a formed on the transport screw 34 to have theshape of a spiral.

Also, a connection member 44 is comprised. The connection member 44 isinstalled on the connection portion between the pyrolysis gas outlet 39e of the pyrolysis chamber 39 and the distillation column 67, and haselasticity to protect the connection portion when the pyrolysis chamber39 is contracted and thermal-expanded in a longitudinal directionthereof, by the repeated driving thereof, as illustrated in FIGS. 6 and7.

Also, the pyrolysis gas outlet 39 e of the above-described pyrolysischamber 39 is installed inside the transfer passage of heat source ofpyrolysis of the waste 43. Also, a second burner 36 is installed in thetransfer passage of heat source of pyrolysis of the waste 43.

In the drawings, reference numeral 51 is a transport pump, referencenumeral 52 is a level control valve, reference numeral 53 is a storingtank of heavy oil, reference numeral 54 is a heat exchanger, referencenumeral 55 is a discharge control valve, reference numerals 56 and 57are storing tanks of light oil, reference numeral 58 is a temperaturecontrol valve, reference numeral 59 is a storing tank of volatile oil,and reference numeral 61 is a oil-water separation device.

The use of the successive pyrolysis system of waste synthetic-highlypolymerized compound in accordance with the present invention will nowbe explained with reference to the attached drawings.

As illustrated in FIG. 1, combustible solid waste including wastesynthetic-highly polymerized compound like waste plastics is providedthrough the transport conveyer 2 to the above-described hopper 3 in apredetermined amount after being crushed and selected.

Here, a predetermined amount of the waste is injected into the hopper 3by controlling a predetermined amount of waste by the volume with thesensor for detecting fixed amount injection 4 installed on theabove-described hopper 3, or by measuring a predetermined weight of thewaste by a load cell system.

The waste injected into the above-described hopper 3 is injected intothe pyrolysis chamber 39 in a predetermined amount by the automaticwaste injection apparatus 1.

The slider 23 of the first slide gate 5 is driven to be opened by thefirst cylinder 20 operated by oil pressure or pneumatic pressure basedon the detection of the sensor for detecting fixed amount injection ofwaste 4 installed on the above-described hopper 3. Then, the first slidegate 5 is driven to be shut off by the first cylinder 20 when apredetermined period of time (3-5 seconds) elapses after thepredetermined amount of waste inside the hopper 3 was injected on thesecond slide gate 6.

Here, the above-described air removing means is driven to removeexternal air and an anaerobic state is created inside the interimstoring hopper 7 between the first and the second slide gates 5 and 6.

That is, the external air flowing into the interim storing hopper 7along with the waste is sucked into the vacuum tank 14 in an instant bythe opening of the vacuum valve 12 connected to the vacuum tank 13 thatcreates a vacuum state by use of the vacuum pump 14, and thereby theinterim storing hopper 7 maintains a vacuum state.

That is, the external air flowing into the interim storing hopper 7passes through the vacuum filter 11, the vacuum valve 12, the vacuumtank 13, and the vacuum pump 14 in turn, and is provided into the gasburning chamber 37.

On the other hand, the slider 23 of the second slide gate 6 is driven tobe opened by the second cylinder 24, and the waste stored in the interimstoring hopper 7 falls down perpendicularly.

Here, as illustrated in FIG. 9, the first pusher 9 is driven to be slidin a horizontal direction by the third cylinder 25 interlocked with thesecond slide gate 6, and moves the waste fallen from the interim storinghopper 7 to the right direction of the drawing.

Then, the second pusher 10 is driven to be slid in a perpendiculardirection by the fourth cylinder 26, and drops the waste at the inlet 8of the pyrolysis chamber 39.

Here, because the waste is compulsorily injected into the inlet 8 of thepyrolysis chamber 39 by the driving of the second pusher 10, thephenomenon, in which a big particle of waste is caught at the inlet ofthe pyrolysis chamber 39 and spins free (so called slip phenomenon) isprevented.

The pyrolysis gas flowing into the interim storing hopper 7 from thepyrolysis chamber 39 is removed by the driving of the above-describedair removing means. The waste discharged from the hopper 3 may besuccessively injected into the pyrolysis chamber 39 in a predeterminedamount by repeating successively performing the above-describedprocesses.

On the other hand, water separation, dehydration, desulfurization,depolymerization, deecarboxylization, breakdown of carbon bond ring (C—Cbond ring), formation of aliphatic group in the shape of a chain,aromatization, breakdown of C—O bond and breakdown of C—N bond occur inthe pyrolysis chamber 39.

When the waste is automatically injected into the pyrolysis chamber 39from the interim storing hopper 7, the waste is moved to the rightdirection in FIG. 1 (the direction marked by an arrow) by the transportwing 34 a formed on the outer circumference of the transport screw 34.While being moved, the waste that is melted and evaporated issuccessively pyrolized by the indirectly provided heat at the pyrolysischamber 39 maintaining a high-temperature and hypoxic environment.

Here, the rotation power of the driving motor 62 of the above-describeddriving means is transmitted to the driven gear 63 a fixed to thetransport screw 34 through the driving gear 63 and chain 64 connected tothe driving motor. Therefore, the transport screw 34 is rotated at apredetermined speed, being supported by a sealing unit 68 mounted on theframe 66 to support bearing that supports both ends of the transportscrew 34 and the casing 70 that forms the pyrolysis chamber 39.

On the other hand, the heat source that indirectly provides heat to thewaste is provided from the gas burning chamber 37 of high temperature.That is, the temperature inside the pyrolysis space of the pyrolysischamber 39 at the initial stage of the driving of the pyrolysis deviceis raised to a predetermined temperature (250 to 450° C.) by the drivingof the gas burning chamber 37 of high temperature that uses light oil orrefined oil.

Here, the gas burning chamber 37 uses initial gas (light oil, etc.)before the temperature inside the gas burning chamber 37 is raised to apredetermined temperature, since the pyrolysis gas is not produced fromthe pyrolysis chamber 39.

The exhaust gas heated at the gas burning chamber 37 indirectly heatsand pyrolizes the waste inside the pyrolysis chamber 39, by moving alongthe space between the inner surface of the casing 70 and the outersurface of the pyrolysis chamber 39 separated therefrom, i.e., thetransfer passage of heat source of pyrolysis of waste 43.

On the other hand, as illustrated in FIG. 4, when the waste injectedinto the above-described pyrolysis chamber 39 is pyrolized, the gapbetween the casing 39 a at the inlet side corresponding to the sectionfor preventing backward flow of gas 40 of the pyrolysis chamber 39 andthe transport wing 34 a is formed to be minimized, and the waste fillsthis gap, and thus, the pyrolysis gas of high temperature from thepyrolysis chamber 39 is prevented from flowing backward to the inlet 8of the pyrolysis chamber 39.

On the other hand, the waste is moved to the side of the outlet 19 alongthe transport space 39 c that is formed to be circular at the lower partof the pyrolysis chamber 39 having a streamlined section, when theabove-described transport screw 34 is driven.

The pyrolysis gas evaporated at the time of pyrolysis of the wastepyrolizes the waste by indirectly providing heat of high temperature,staying at the staying space 39 d formed at the upper part of thepyrolysis chamber 39, and then is discharged to the catalyst reactioncolumn 45 through the pyrolysis gas outlet 39 e.

Also, since the pyrolysis gas is discharged after going through theprocesses of production and condensation of the pyrolysis gas inside thepyrolysis chamber 39, the waste plastics provide lubricating effects onthe transport wing 34 a of the transport screw 34 and the inside of thepyrolysis chamber 39, and provides lubricating effects on the slidegates 5 and 6 of the waste injection device 1 and discharging device101.

Therefore, a separate lubricating means is not necessary.

On the other hand, the pyrolysis gas discharged through the pyrolysisgas outlet 39 e after being pyrolized passes through the catalystreaction column 45 and is cracked from high molecular weight gas to lowmolecular weight gas, after passing through desulfurization,denitrification, and dechloination removing device, and then istransported to the distillation column 67. In the distillation column67, refined oil like heavy oil, light oil and volatile oil is producedaccording to the boiling points from the pyrolysis gas, and a part ofthe refined oil is provided to the main burner 35 of the gas burningchamber 37 as initial fuel.

Here, the pyrolysis gas outlet 39 e is formed at the upper part of theend of the pyrolysis chamber 39 inside the transfer passage of heatsource of pyrolysis 43.

Therefore, when the refined oil producing means 100 is operated, thedistillation equipment and the exhaust gas of the pyrolysis chamber 39have the same temperature, and therefore the emulsification process fromthe waste synthetic-highly polymerized compound is normally performed.

On the other hand, the pyrolysis gas discharged from the pyrolysischamber 39 is reformed by going through the synthetic zeolite catalystcolumn 45 connected to the pyrolysis gas outlet 39 e. The reactiontemperature of the catalyst column 45 is 220-400° C., and here, thecarbon rings of the pyrolysis gas are decomposed to smaller carbonrings, and the pyrolysis gas is reformed to smaller hydrocarbon, andthereby a large amount of light oil is produced.

The production of wax and tar having many carbon rings is minimized byletting the pyrolysis gas go through the catalyst column 45. Heavy oilis produce at the lower part of the distillation column 67 bycontrolling the temperature to be more than 360° C., light oilcomponents are extracted at the middle part of the distillation column67 by controlling the temperature to be 240-350° C., and volatile oilcomponents are extracted at the upper part of the distillation column 67by controlling the temperature to be below 130° C.

The remnants (char) moved toward the outlet 18 along the transport wing34 a after going through the pyrolysis process is moved toward theabove-described automatic discharging device 101. When the slider 23 isdriven to be open by the first cylinder 20 of the above-described firstslide gate 5, the pyrolized remnants are injected into the interimstoring hopper 19 and the slider 23 is shut off after a setup time (3-5seconds) elapses.

Here, a small amount of pyrolysis gas that flows into the interimstoring hopper 19 along with the remnants is removed by the opening ofthe vacuum valve 12 connected to the vacuum pump 14, and thereby theinside of the interim storing hopper 19 maintains an anaerobic state.

After the ashes are safely discharged to the outside by the opening ofthe above-described second slide gate 6, the slider 23 of the secondslide gate 6 is shut off. Here, the external air that flows into theinterim storing hopper 19 from the outside is sucked into the vacuumtank 13 by the opening of the above-described vacuum valve 12, and thusthe interim storing hopper 19 maintains an anaerobic state.

Accordingly, the ashes transported after being pyrolized in theabove-described pyrolysis chamber 39 may be successively discharged.

On the other hand, if the opening and the shutting off operation of theslider 23 is interfered by the foreign materials accumulated at the endof the slider 23 or in the guiding groove 22 by the successive drivingof the first and the second slide gates 5 and 6 (when the first and thesecond gates 5 and 6 malfunction), the guiding groove (22) may beprevented from being blocked by using the foreign material removing case31 formed to communicate with the end of the guiding groove 22. Here, itis needless to say that the foreign material accumulated in theabove-described foreign material removing case 31 may be removed byopening the door 31 a during the operation of the device.

When the above-described first and second cylinders 20,24 are driven,the sealing is maintained by the ball 27, which presses and supports theupper surface of the slider 23 horizontally moving along the guidinggroove 22 formed in the gate body 21 and the extension guide 21 aagainst the gate body 21 and the extension guide 21 a.

Accordingly, the leakage of gas or air through the guiding groove 22 isprevented.

The guider 30 mounted on the connection groove 22 formed between theextension guide 21 a and the slider 23 enables precise horizontalmovement and reciprocating driving of the slider 23, and preventsfriction between the gate body 21 and the slider 23.

By repeating performing this process, the inside of the above-describedpyrolysis chamber 39 continuously maintains a high-temperature andhypoxic state, which enables successive pyrolysis operation.

The pyrolysis speed of the waste injected into the inlet of thepyrolysis chamber 39 is determined by the composition ratio and moisturecontent of the waste. The waste is successively moved to the rightdirection (the direction marked by an arrow) of FIG. 1 along thetransport wing 34 a formed on the transport screw 34 in the shape of aspiral. Here, the transport screw 34 is variably driven by the variabledriving of the above-described driving motor 62, and thereby thepyrolysis speed of the waste is variably adjusted and the pyrolysisyield may be improved.

On the other hand, in a case where the temperature of the inside of theabove-described pyrolysis chamber 39 is maintained at 250-450° C., thebody of the pyrolysis chamber 39 and the transport screw 34 arerepeatedly contracted and expanded in a longitudinal direction thereofby the heat of high-temperature. Here, the connection member 44 havingelasticity that is installed at the connection portion between thepyrolysis gas outlet 39 e and the distillation column 67 protects theconnection portion, when the pyrolysis chamber 39 is contracted andthermal-expanded in a longitudinal direction thereof (15-40 mm ofthermal expansion occurs) due to the repetitive operation thereof.

The air and gas, which flows into the interim storing hopper 19 betweenthe first and the second slide gates 5 and 6 when pyrolized remnants aredischarged, are provided to the gas burning chamber 37 by way of thevacuum filter 11, the vacuum valve 12, the vacuum tank 13 and the vacuumpump 14, like in the first and the second slide gates 3 and 4.

As shown above, the successive pyrolysis system of wastesynthetic-highly polymerized compound in accordance with the presentinvention has the following advantages.

The rate of operation of the pyrolysis device is maximized bysuccessively injecting the waste in a predetermined amount andsuccessively discharging ashes discharged after going through thepyrolysis process, when pyrolizing combustible high-polymerized compoundlike waste plastics by indirect heating at the pyrolysis chambermaintaining a high-temperature and anaerobic or hypoxic environment.

Also, the distillation column for producing refined oil according to theboiling points from the pyrolysis gas is installed perpendicularly tothe upper part of the pyrolysis gas outlet. The after service expensesis reduced and the durability is increased by installing a buffer meanson the connection portion between the pyrolysis gas outlet and thedistillation column and protecting the connection portion againstcontraction and thermal expansion.

Also, waste can be used as energy source by producing refined oilincluding heavy oil, light oil and volatile oil according to the boilingpoints from the pyrolysis gas at the distillation column and reusing itas heat source of pyrolysis of the waste.

Also, the pyrolysis speed of the waste is obviously improved byoptimizing the contact surface area of the heat source of the pyrolysisthat indirectly contacts the waste at the time of the pyrolysis.

The foregoing embodiment and advantages are merely exemplary and are notto be construed as limiting the present invention. The present teachingcan be readily applied to other types of apparatuses. Also, thedescription of the embodiments of the present invention is intended tobe illustrative, and not to limit the scope of the claims, and manyalternatives, modifications, and variations will be apparent to thoseskilled in the art.

1. A successive pyrolysis system of waste synthetic-highly polymerizedcompound, comprising: a hopper, which waste is provided to and is storedin a predetermined amount; an automatic waste injection device, whichdischarges a predetermined amount of waste from the hopper, andcomprises an air removing means for maintaining a hypoxic environmentinside by removing external -air flowing in along with the waste; apyrolysis chamber for maintaining a high-temperature and hypoxicenvironment, and successively pyrolizing the waste by indirect heating,in which two or more transport screws are installed rotatably by adriving means to transport, melt and evaporate the waste provided fromthe waste injection device; a gas burning chamber for burningnoncondensable gas among pyrolysis gas produced at the time of thepyrolysis of the waste, and providing heat of a predeterminedtemperature to the outer surface of the pyrolysis chamber to be used asheat source for the pyrolysis of the waste provided to the pyrolysischamber; a refined oil producing means connected perpendicularly to theupper part of a gas outlet of the pyrolysis chamber, for producingrefined oil from the pyrolysis gas catalyst reacted at a catalysisreaction column according to boiling point at a distillation column, andproviding residual noncondensable gas that is not condensed to the gasburning chamber as initial fuel; and an automatic discharging device forsuccessively discharging ashes transported after being pyrolized fromthe pyrolysis chamber, comprising an air removing means for maintaininga hypoxic environment inside by removing external air, which flows infrom the outside when discharging ashes, and the pyrolysis gasdischarged from the pyrolysis chamber
 2. The successive pyrolysis systemof waste synthetic-highly polymerized compound according to claim 1,wherein the automatic waste injection device and discharging devicecomprise: a first slide gate, which is driven by a first cylinder to beslidingly moved along a guiding groove formed in a gate body, andrespectively opens and shuts off the outlet of the hopper and the outletof pyrolized remnants; and a second slide gate, which is driven by asecond cylinder to be slidingly moved along a guiding groove formed in agate body and forms an interim storing hopper for maintaining a hypoxicstate in a space between the first slide gate
 3. The successivepyrolysis system of waste synthetic-highly polymerized compoundaccording to claim 1, wherein the waste is measured by a load cell or aphoto sensor and then is injected into the hopper to store the waste inthe hopper in a predetermined amount by a sensor for detecting fixedamount injection installed on the hopper
 4. The successive pyrolysissystem of waste synthetic-highly polymerized compound according to claim3, wherein the first and second slide gates comprise: an extension guideformed to be extended from the gate body for supporting the slider toslide in a horizontal direction when the slider secedes from the guidinggroove; a seal maintaining means consisting of a ball for maintainingseal by pressing the upper surface of the slider moving slidingly alongthe guide groove formed in the gate body and the extension guide andsticking the slider to the body, and an elastic member for elasticallysupporting the ball; and a guider connected to a connection grooveformed between the bottom surface of the slider and the contact surfaceof the extension guide, for preventing friction between the gate bodyand the slider when the slider moves
 5. The successive pyrolysis systemof waste synthetic-highly polymerized compound according to claim 4,wherein the quality of the material of the guider is weaker than thequality of material of the slider to prevent the slider from beingbroken by friction when the slider moves
 6. The successive pyrolysissystem of waste synthetic-highly polymerized compound according to claim4, comprising a foreign material removing case mounted on the gate bodyto communicate with the guiding grooves of the first and the secondslide gates for accumulating foreign materials discharged from theguiding grooves when the slider moves
 7. The successive pyrolysis systemof waste synthetic-highly polymerized compound according to claim 1,wherein the pyrolysis chamber comprises: a section for preventingbackward flow of gas having a circular section, for minimizing the gapbetween the transport screw and the inlet and outlet casings of thepyrolysis chamber and intercepting backward flow of the pyrolysis gas; atransport space formed on the lower part of the pyrolysis chamber, fortransporting waste when the transport screw is driven; and a pyrolysisgas staying space formed on the upper part of the pyrolysis chamber, forholding the pyrolysis gas evaporated at the time of pyrolysis of thewaste
 8. The successive pyrolysis system of waste synthetic-highlypolymerized compound according to claim 1, wherein the cross section ofthe pyrolysis chamber is formed to be a circle, an oval, a rectangle ora streamline
 9. The successive pyrolysis system of wastesynthetic-highly polymerized compound according to claim 7, wherein thesize of the pyrolysis gas staying space of the pyrolysis chamber isformed to be a half of the size of the diameter of the transport wingformed on the transport screw in the shape of a spiral
 10. Thesuccessive pyrolysis system of waste synthetic-highly polymerizedcompound according to claim 1, wherein comprising a connection memberthat is installed on the connection portion between the pyrolysis gasoutlet of the pyrolysis chamber and the distillation column, and haselasticity to protect the connection portion when the pyrolysis chamberis contracted and thermal-expanded in a longitudinal direction thereof,by the repeated driving thereof
 11. The successive pyrolysis system ofwaste synthetic-highly polymerized compound according to claim 1,wherein the pyrolysis gas outlet of the pyrolysis chamber is installedinside the transfer passage of heat source of pyrolysis of the waste.12. The successive pyrolysis system of waste synthetic-highlypolymerized compound according to claim 1, wherein the waste injectiondevice comprises: a first pusher installed on the bottom of the secondslide gate to be slidingly moved in a horizontal direction, when a thirdcylinder is driven, for moving the waste discharged from the interimstoring hopper in a horizontal direction; and a second pusher installedon the perpendicular upper part of the inlet of the pyrolysis chamber tobe slidingly moved upward and downward, when a fourth cylinder isdriven, for injecting the waste moved by the first pusher into the inletof the pyrolysis chamber
 13. The successive pyrolysis system of wastesynthetic-highly polymerized compound according to claim 1, wherein asecond burner is installed in the transfer passage of heat source ofpyrolysis for pyrolizing the waste